Membrane cleaning device and method in membrane separating technology and its application

Abstract

The membrane cleaning device includes one back washing water intake pipeline connected to the membrane filter, and one pulse air pipeline connected to the back washing water intake pipeline to adding compressed air into the water flow of the back washing water intake pipeline. The pulse air pipeline includes one pulse valve connected directly to the back washing water intake pipeline, one air compressor with air storing packet and connected to the pulse valve and one PLC control system to control the pulse valve. The device of the present invention can generate high strength pulse air-mixing water flow to clean membrane, especially hollow fiber membrane effectively. The present invention may be used widely in the water flooding treatment of hyposmosis oil field, pure water preparation, product purification, waste water treatment, etc.

Description

technical field [0001] The invention relates to a membrane separation technology, in particular to a membrane cleaning method and device in the membrane separation technology and its application in low-permeability oil field injection water quality treatment, pure water preparation, product purification and wastewater as reuse water treatment. Background technique [0002] Membrane material is a kind of porous medium. The membrane separation process is the process in which the solvent in the treated liquid passes through the membrane under pressure and the solute is trapped. [0003] One of the keys to the application of membrane separation technology is membrane cleaning and regeneration technology. Although microfiltration mainly has the function of sieving and intercepting, generally speaking, there is less adsorption in the pores. But concentration polarization and membrane fouling are almost inevitable. To maintain high membrane flux, proper cleaning techniques are cr...

AI Technical Summary

Problems solved by technology

The two-position three-way valve does not have the function of quick opening and closing. After the air enters the cylinder, the air is pressed out by the movement of the piston. A pulse process takes at least a few seconds, and no obvious pulse effect can be formed.

[0010] (2) It is also difficult to achieve sufficient and uniform mixing in the frontal contact between compressed gas and water, especially the gas cannot be dispersed quickly, forming fine bubbles, and the effect of gas-water recoil is greatly reduced

[0012] (4) Since the mechanical disc of the ordinary three-way valve cannot meet the requirements of frequent opening and closing, the frequency of backwashing is limited, which is extremely unfavorable to the use of the membrane

[0013] Therefore, the recoil cleaning effect of the above-mentioned device is relatively poor

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